Currently my only DAC/AMP is a Fiio X5. It works great on the go and as an external DAC/AMP for my PC at home. I have Beyer DT770 80-ohm. Problem is at work... I sometimes like to play Spotify Premium while I work during the day. There is no wifi in my office and I don't want to use cell data on my iPhone or iPad, so using the internet on my work PC is the only real option. Problem is I don't have the admin rights on my work PC to install the required drivers for the X5 (I requested permission from our IT department and was denied). So does anyone know a good DAC/AMP combo to drive the DT770's that DOES NOT REQUIRE ANY DRIVER INSTALLATION? Maybe the JDS Labs O2/ODAC? Thanks!